STM32 / Photon - TX / RX LED for serial communication indicator

Hi, I’ve tried to make a rs485 shield for the photon, but I didn’t check if there was any way add a kind of RX/TX led before I ordered the pcbs.

Should this work ?

Hey there–you mean an LED that turns on whenever there is activity over the Rx and Tx line?

That looks right to me, but I’ve only designed a handful of PCBs :slight_smile: Note that those are the hardware serial pins, so if you want to see LED activity using USB serial, you’d have to wire those up separately.

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@ekarlso, did you test on a protoboard just to be sure?

Tested by using the continuity with a DMM and found that the connection in between the photon and the LED was faulty :wink:

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